US9467268B2ExpiredUtilityA1

Apparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system

92
Assignee: SAMSUNG ELECTRONICS CO LTDPriority: Aug 29, 2005Filed: Sep 25, 2013Granted: Oct 11, 2016
Est. expiryAug 29, 2025(expired)· nominal 20-yr term from priority
Inventors:Hwan-Joon KwonKyeong-In JeongJin-Kyu HanDong-Hee Kim
H04W 72/21H04W 72/542H04L 5/0053H04B 7/0689H04L 5/0057H04W 52/247H04B 17/24H04W 24/08H04W 52/225H04L 1/0003H04B 17/30H04W 24/10H04L 1/0026H04B 17/327H04L 27/2601H04B 17/26H04L 5/0007H04W 52/325H04W 72/0453H04B 17/309H04B 17/202H04W 72/1231H04W 72/1284
92
PatentIndex Score
7
Cited by
22
References
38
Claims

Abstract

An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). In the OFDMA wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed. A base station controls power of a physical channel using information fed back from a mobile station. In a method for feeding back channel quality information from the mobile station, sub-band-by-sub-band channel quality information is measured and channel-by-channel quality information of a number of channels is transmitted in order of sub-bands of better channel quality information. Average channel quality information for a total band is measured and transmitted.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A method for feeding back channel quality information (CQI), at a mobile station, in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the method comprising:
 calculating, at the mobile station, a wideband CQI for an entire band, the entire band including at least two sub-bands; 
 calculating, at the mobile station, at least one sub-band CQI for the at least one sub-band; 
 transmitting, at the mobile station, the at least one sub-band CQI for the at least one sub-band at a transmission time interval for a sub-band CQI transmission; and 
 transmitting, at the mobile station, the wideband CQI at a transmission time interval for a wideband CQI, 
 wherein the transmission time interval for a wideband CQI is set based on N times of number of the transmission time interval for a sub-band CQI transmission, and 
 wherein N is an integer greater than 1. 
 
     
     
       2. The method of  claim 1 , wherein the N is configured by a base station. 
     
     
       3. The method of  claim 1 , wherein a number of sub-bands are configured by a base station. 
     
     
       4. The method of  claim 1 , wherein the at least one sub-band for the sub-band CQI transmission is configured by a base station. 
     
     
       5. The method of  claim 1 , wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station. 
     
     
       6. The method of  claim 4 , wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-hand does not include at least one index indicating a position of the at least one sub-band but at least one CQI value. 
     
     
       7. The method of  claim 5 , wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       8. The method of  claim 1 , further comprising:
 performing a channel encoding process for the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band before transmitting the at least one sub-band CQI for the at least one sub-band and transmitting the wideband CQI; 
 modulating the encoded wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band based on a set modulation scheme; and 
 performing physical channel configuration to insert the modulated wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band into a physical channel allocated in a reverse direction in the wireless communication system based on OFDMA. 
 
     
     
       9. The method of  claim 1 ,
 wherein the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band are transmitted during the same transmission time interval. 
 
     
     
       10. The method of  claim 9 , wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       11. An apparatus for feeding back channel quality information (CQI), at a mobile station, in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the method comprising:
 a controller configured to:
 calculate a wideband CQI for an entire band, the entire band including at least two sub-bands, and 
 calculate at least one sub-band CQI for the at least one sub-band; and a transmitter configured to: 
 transmit at the at least one sub-band CQI for the at least one sub-band at a transmission time interval for a sub-band CQI transmission and the wideband CQI at a transmission time interval for a wideband CQI transmission, 
 wherein the transmission time interval for a wideband CQI is set based on N times of a number of the transmission time interval for a sub-band CQI transmission, and 
 
 wherein N is an integer greater than 1. 
 
     
     
       12. The apparatus of  claim 11 , wherein the N is configured by a base station. 
     
     
       13. The apparatus of  claim 11 , wherein a number of sub-bands are configured by a base station. 
     
     
       14. The apparatus of  claim 11 , wherein the at least one sub-band for the sub-band CQI transmission is configured by a base station. 
     
     
       15. The apparatus of  claim 11 , wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station. 
     
     
       16. The apparatus of  claim 14 , wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value. 
     
     
       17. The apparatus of  claim 15 , wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       18. The apparatus of  claim 11 , further comprising:
 a channel encoder configured to perform channel encoding for the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band before transmitting at least one sub-band CQI for the at least one sub-band and transmitting the wideband CQI; 
 a modulator configured to modulate the encoded wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band based on a set modulation scheme; and 
 a physical channel configurator configured to insert the modulated wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band into a physical channel allocated in a reverse direction in the wireless communication system based on OFDMA. 
 
     
     
       19. The apparatus of  claim 11 ,
 wherein the transmitter transmits the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band during the same transmission time interval. 
 
     
     
       20. The apparatus of  claim 19 , wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       21. A method for receiving, at a base station, channel quality information (CQI) transmitted from a mobile station in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the method comprising:
 receiving, at the base station, at least one sub-band CQI for at least one sub-band at a transmission time interval for a sub-band CQI transmission; 
 receiving, at the base station, a wideband CQI for an entire band at a transmission time interval for a wideband CQI transmission, 
 the entire band including at least two sub-bands, 
 wherein the transmission time interval for a wideband CQI is set based on N times of a number of the transmission time interval for a sub-band CQI transmission, and 
 wherein N is an integer greater than 1. 
 
     
     
       22. method of  claim 21 , wherein the N is configured by the base station. 
     
     
       23. The method of  claim 21 , wherein a number of sub-bands are configured by the base station. 
     
     
       24. The method of  claim 21 , wherein the at least one sub-band for the sub-band CQI transmission is configured by the base station. 
     
     
       25. The method of  claim 21 , wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station. 
     
     
       26. The method of  claim 24 , wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value. 
     
     
       27. The method of  claim 25 , wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       28. The method of  claim 21 ,
 wherein the wideband CQI is for an entire band, and 
 wherein the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band are received during the same transmission time interval. 
 
     
     
       29. The method of  claim 28 , wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       30. An apparatus for receiving, at a base station, channel quality information (CQI) transmitted from a mobile station in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the apparatus comprising:
 a receiver configured to:
 receive, at the base station, at least one sub-band CQI for at least one sub-band at a transmission time interval for a sub-band CQI transmission and a wideband CQI for an entire band at a transmission time interval for a wideband CQI transmission, the entire band including at least two sub-bands; and 
 
 a controller, 
 wherein the transmission time interval for the wideband CQI is set based on N times of a number of the transmission time interval for the at least one sub-band CQI transmission, and 
 wherein N is an integer greater than 1. 
 
     
     
       31. the apparatus of  claim 30 , wherein the N is configured by the base station. 
     
     
       32. The apparatus of  claim 30 , wherein a number of sub-bands are configured by the base station. 
     
     
       33. The apparatus of  claim 30 , wherein the at least one sub-band for the sub-band CQI transmission is configured by the base station. 
     
     
       34. The apparatus of  claim 30 , wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station. 
     
     
       35. The apparatus of  claim 33 , wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value. 
     
     
       36. The apparatus of  claim 34 , wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band. 
     
     
       37. The apparatus of  claim 30 , wherein the transmission time interval for the wideband CQI for the entire band and the transmission time interval for the at least one sub-band CQI for the at least one sub-band is the same transmission time interval. 
     
     
       38. The apparatus of  claim 37 , wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

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